作者:Barry M. Trost、Hanbiao Yang、Oliver R. Thiel、Alison J. Frontier、Cheyenne S. Brindle
DOI:10.1021/ja067305j
日期:2007.2.1
A ring-expanded bryostatin analogue was synthesized by utilizing a Ru-catalyzed tandem tetrahydropyran formation, a Pd-catalyzed tandem dihydropyran formation, and a ring-closing metathesis (RCM) as key steps. The analogue possesses potent antitumor activity against the NCI-ADR cancer cell line with an IC50 of 123 nM.
Sequential Ru−Pd Catalysis: A Two-Catalyst One-Pot Protocol for the Synthesis of N- and O-Heterocycles
作者:Barry M. Trost、Michelle R. Machacek、Brian D. Faulk
DOI:10.1021/ja060812g
日期:2006.5.1
differs between the use of amine versus alcohol nucleophiles. The method also affords heterocyclic products that are synthetically useful intermediates. Through the Z-vinylsilane a variety of stereodefined trisubstituted olefin products can be accessed including several all-carbon motifs. Finally, the utility of these heterocyclic products in total synthesis is demonstrated through concise syntheses
Total Syntheses of Bryostatins: Synthesis of Two Ring-Expanded Bryostatin Analogues and the Development of a New-Generation Strategy to Access the C7-C27 Fragment
作者:Barry M. Trost、Hanbiao Yang、Guangbin Dong
DOI:10.1002/chem.201002932
日期:2011.8.22
synthesis of novel ring‐expanded bryostatin analogues. By carefully modifying the substrate, a selective and high‐yielding Ru‐catalyzed tandem enyne coupling/Michael addition was employed to construct the northern fragment. Ring‐closing metathesis was utilized to form the 31‐membered ring macrocycle of the analogue. These ring‐expanded bryostatin analogues possess anticancer activity against several
在此,我们报告了新型扩环苔藓抑素类似物的合成。通过仔细修改底物,采用选择性和高产率的 Ru 催化串联烯炔偶联/迈克尔加成来构建北部片段。利用闭环复分解形成类似物的 31 元环大环。这些扩环的苔藓抑素类似物对几种癌细胞系具有抗癌活性。鉴于在后期形成 C16-C17 烯烃的困难,我们还描述了我们开发的新一代策略,以获取包含环 B 和 C 亚基的 C7-C27 片段。
Synthesis of the ABCDEFG Ring System of Maitotoxin
作者:K. C. Nicolaou、Robert J. Aversa、Jian Jin、Fatima Rivas
DOI:10.1021/ja102260q
日期:2010.5.19
correctness of the originally assigned structure to this polycyclic system of the natural product. The synthetic strategy for the synthesis of 3 relied heavily on our previously developed furan-based technology involving sequential Noyori asymmetric reduction and Achmatowicz rearrangement for the construction of the required tetrahydropyran buildingblocks, and employed a B-alkyl Suzuki coupling and a Hor
Atom-Economic and Stereoselective Syntheses of the Ring A and B Subunits of the Bryostatins
作者:Barry M. Trost、Hanbiao Yang、Cheyenne S. Brindle、Guangbin Dong
DOI:10.1002/chem.201002930
日期:2011.8.22
subunits of bryostatins. A Ru‐catalyzedtandem alkene–alkyne coupling/Michael addition reaction was developed and applied to the synthesis of bryostatin ring B. We explored an acetylide‐mediated epoxide‐opening/6‐exo‐dig cyclization route to access the bryostatin ring A, although ring A was eventually furnished through an acid‐catalyzedtandem transketalization/ketalization sequence. In addition, a dinuclear
本文描述了苔藓抑素环 A 和 B 亚基立体选择性组装的化学选择性和原子经济方法。钌催化的串联烯烃-炔耦合/迈克尔加成反应的开发和应用到苔藓抑素环B的合成我们探讨乙炔化介导的环氧化物的开/ 6-外型-挖环化路径访问的苔藓抑素环A,虽然环 A 最终通过酸催化的串联转缩酮/缩酮化序列提供。此外,还评估了双核锌催化甲基乙烯基酮(MVK)羟醛策略用于构建聚乙酸酯部分。这些方法的使用最终导致了包含环 A 和 B 亚基的北部苔藓抑素片段的快速组装。